Can you explain the function of this.$nextTick()?

I'm a beginner with Vue.js and I'm trying to wrap my head around the logic of using nextTick in a method. I have two components set up like this:

IsTuruIslem.vue

<template>
...
  <t-row>
      <is-turu-islem-goruntule ref="isTuruIslemGoruntule" 
                              @kaydet="kaydet" 
                              @guncelle="guncelle">
      </is-turu-islem-goruntule>
    </t-row>
...
</template>
<script>
...
    isTuruIslemPopupAc(detay) {
      if (!detay) this.$refs.isTuruIslemGoruntule.open();
      else {
        let updatedDetail = JSON.parse(JSON.stringify(detay));
        console.log("Popup:", updatedDetail);
        this.$refs.isTuruIslemGoruntule.open({
          isUpdate: true,
          detail: updatedDetail
        });
      }
    }
...
</script>

IsTuruIslemGoruntule.vue

<template>
...
<t-row>
      <t-col :span="20">
        <t-select
          id="sirket"
          ref="sirket"
          label="Company *"
          v-model="detail.company"
          item-value="id"
          item-text="description"
        />
      </t-col>
    </t-row>
    <t-row>
      <t-col :span="20">
        <t-select
          id="cmb_status"
          ref="status"
          label="Status"
          itemText="text"
          itemValue="id"
          v-model="detail.statusBaseDTO"
          :readonly="false"
          :clearable="true"
          :disabled="false"
        />
      </t-col>
....
</template>
<script>
...
methods: {
    open: function(options) {
      this.isOpen = true;
      if (options) {
        this.isUpdate = true;
        this.detail = JSON.parse(JSON.stringify(options.detail));
      } else {
        this.detail = {};
      }

      //this.$nextTick(() => {
      this.$refs.status
        .get("/ytts/api/common/status/activeInactive", null)
        .then(data => {})
        .catch(err => null);

      this.$refs.process
        .get("/ytts/api/definitionManagement/process/query/processList")
        .then(data => {})
        .catch(err => null);

      this.$refs.company
        .get("/ytts/api/definitionManagement/process/query/companyList")
        .then(data => {})
        .catch(err => null);
      //});
      //console.log("DETAIL:", this.detail);
    },
...
</script>

In the provided code example, I am encountering issues where the code doesn't work properly and throws an error "Cannot read property 'get' of undefined" at the line containing this.$refs.status. However, when I uncomment the nextTick method located above this.$refs.status, everything magically starts working. I'm struggling to grasp the reason behind this usage. Could someone provide a clear explanation? I appreciate your attention.

Answer №1

If you conditionally create the <t-select ref="durum"> component (for example, using v-if), then the existence of this.$refs.durum is dependent on whether the component has been successfully created.

For instance, if you toggle the creation of the component with something like v-if="show", where initially show is set to false, and later in your method you set show to true, the component won't be instantly created upon changing the value. Instead, you need to wait for Vue to update the DOM due to performance reasons. To achieve this, you should use $nextTick to pause execution until that moment, ensuring that the component is properly created and therefore this.$refs.durum actually exists.

Based on the information provided, it seems that the visibility of the component might be controlled by a variable named isOpen.

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